import { Snackbar } from './index';
export declare class SnackbarQueueManager {
    _queue: Snackbar[];
    _snack: Snackbar;
    _ntm: number;
    _nextHandler: () => void;
    constructor();
    _schedule(): void;
    _next(): void;
    add(snack: Snackbar): void;
    remove(snack: Snackbar): void;
}